Mr Stowe left in the 70-foot (21m) two-masted sailing boat in April 2007.
Guinness World Records say they are looking into the claim that the trip sets a new record for the longest voyage.
Mr Stowe set off from New Jersey on a round-the-world trip which finished in Manhattan.
He originally set off with his girlfriend, Soanya Ahmad, 26, until she had to return to shore after suspecting she was pregnant.
The couple agreed that he would continue without her, despite it meaning that he would miss the birth of their son.
He said that seeing her go was the hardest part of his trip.
“Before we left, we had an agreement that if I had to get off for any reason, he would go on,” Ms Ahmad said.
“I knew if he came back and didn’t finish the voyage, he would just go back again. There was no way he wasn’t going to finish it.”
Yoga and painting
Mr Stowe said his trip was a “voyage of love” The vessel was built by Mr Stowe and his family 30 years ago, and named “Anne” after his mother.
While at sea, Mr Stowe says he spent his time repairing torn sails, painting, practising yoga and writing a book.
He was able to send e-mails and make satellite phone calls.
Mr Stowe refers to his trip as a “voyage of love”.
“She’s done what no vessel in the world has done,” Mr Stowe said.
“She got worn out and beat down to death.
“I’ll tell you that boat will take me for another year and there is still a years worth of food on that boat… It’s a magical boat, it’s full of love.”
Charles Doane, editor of Sail magazine, said he believes that Mr Stowe set a new sailing record.
He said that the GPS satellite system that tracked the voyage provides evidence that the boat had not touched land during the trip.
1. “Impossible is just a big word thrown around by small men who find it easier to live in the world they’ve been given than to explore the power they have to change it. Impossible is not a fact. It’s an opinion. Impossible is not a declaration. It’s a dare. Impossible is potential. Impossible is temporary. Impossible is nothing.” –Muhammad Ali (Boxer)
2. “It’s not whether you get knocked down, it’s whether you get up.” –Vince Lombardi (NFL Football Coach)
3. “It is more difficult to stay on top than to get there.” –Mia Hamm (Soccer Player)
4. “I’ve failed over and over and over again in my life and that is why I succeed.” –Michael Jordan (Basketball Player)
5. “If it doesn’t challenge you, it won’t change you.” –Fred Devito (Yoga Instructor)
6. “It’s better to look ahead and prepare than to look back and regret.” –Jackie Joyner Kersee (Olympic Track & Field)
7. “When my time on Earth is gone, and my activities here are past, I want them to bury me upside down, and my critics can kiss my ass.” –Bobby Knight (Basketball Coach)
8. “As you walk down the fairway of life you must smell the roses, for you only get to play one round.” — Ben Hogan (Golfer)
9. “I always tell kids, you have two eyes and one mouth. Keep two open and one closed. You never learn anything if you’re the one talking.” –Gordie Howe (Hockey Player)
10. “Mental will is a muscle that needs exercise, just like muscles of the body.” –Lynn Jennings (Long-distance Runner)
11. “It ain’t over till it’s over.” –Yogi Berra (Baseball Player)
12. “Never underestimate the power of dreams and the influence of the human spirit. The potential for greatness lives within each of us.” –Wilma Rudolph (Olympic Track & Field)
13. “You miss 100 percent of the shots you don’t take.” –Wayne Gretzky (Hockey Player)
14. “What do do with a mistake: recognize it, admit it, learn from it, forget it.” –Dean Smith (Basketball Coach)
15. “Today I will do what others won’t, so tomorrow I can accomplish what others can’t.” –Jerry Rice (Football Player)
16. “Whoever said, ‘It’s not whether you win or lose that counts,’ probably lost.” –Martina Navratilova (Tennis Player)
17. “The more difficult the victory, the greater the happiness in winning.” –Pele (Soccer Player)
18. “It is not the size of a man but the size of his heart that matters.” –Evander Holyfield (Boxer)
19. “Each of us has a fire in our hearts for something. It’s our goal in life to find it and keep it lit.” –Mary Lou Retton (Olympic gymnast)
20. “Make sure your worst enemy doesn’t live between your own two ears.” –Laird Hamilton (Surfer)
21. “The worst thing I can be is the same as everybody else. I hate that.” –Arnold Schwarzenegger (Bodybuilder)
22. “Be bold. If you’re going to make an error, make a doozy, and don’t be afraid to hit the ball.” –Billie Jean King (Tennis Player)
Natalie Portman has a B.A. in Psychology from Harvard and has been published in two scientific journals.
Mayim Bialik has a Ph.D. in neuroscience. The former star of TV’s Blossom now plays Dr. Amy Farah Fowler, a neurobiologist, on The Big Bang Theory
Kris Kristofferson was a rugby star in college who became a Rhodes Scholar, graduating from Oxford with a BPhil (the equivalent of a Master’s degree) in English Literature. He then joined the military and became a helicopter pilot and a U.S. Army Ranger (e.g., a member of the U.S. special forces). He later became one of the most successful and celebrated country music stars of all time, as well as a successful film actor.